1223013Sdim//===-- TargetSelect.cpp - Target Chooser Code ----------------------------===// 2223013Sdim// 3223013Sdim// The LLVM Compiler Infrastructure 4223013Sdim// 5223013Sdim// This file is distributed under the University of Illinois Open Source 6223013Sdim// License. See LICENSE.TXT for details. 7223013Sdim// 8223013Sdim//===----------------------------------------------------------------------===// 9223013Sdim// 10234353Sdim// This just asks the TargetRegistry for the appropriate target to use, and 11234353Sdim// allows the user to specify a specific one on the commandline with -march=x, 12234353Sdim// -mcpu=y, and -mattr=a,-b,+c. Clients should initialize targets prior to 13234353Sdim// calling selectTarget(). 14223013Sdim// 15223013Sdim//===----------------------------------------------------------------------===// 16223013Sdim 17223013Sdim#include "llvm/ExecutionEngine/ExecutionEngine.h" 18223013Sdim#include "llvm/ADT/Triple.h" 19249423Sdim#include "llvm/IR/Module.h" 20224145Sdim#include "llvm/MC/SubtargetFeature.h" 21223013Sdim#include "llvm/Support/CommandLine.h" 22226633Sdim#include "llvm/Support/Host.h" 23226633Sdim#include "llvm/Support/TargetRegistry.h" 24249423Sdim#include "llvm/Target/TargetMachine.h" 25234353Sdim 26223013Sdimusing namespace llvm; 27223013Sdim 28234353SdimTargetMachine *EngineBuilder::selectTarget() { 29243830Sdim Triple TT; 30243830Sdim 31243830Sdim // MCJIT can generate code for remote targets, but the old JIT and Interpreter 32243830Sdim // must use the host architecture. 33243830Sdim if (UseMCJIT && WhichEngine != EngineKind::Interpreter && M) 34243830Sdim TT.setTriple(M->getTargetTriple()); 35249423Sdim 36234353Sdim return selectTarget(TT, MArch, MCPU, MAttrs); 37234353Sdim} 38234353Sdim 39223013Sdim/// selectTarget - Pick a target either via -march or by guessing the native 40223013Sdim/// arch. Add any CPU features specified via -mcpu or -mattr. 41234353SdimTargetMachine *EngineBuilder::selectTarget(const Triple &TargetTriple, 42223013Sdim StringRef MArch, 43223013Sdim StringRef MCPU, 44234353Sdim const SmallVectorImpl<std::string>& MAttrs) { 45234353Sdim Triple TheTriple(TargetTriple); 46223013Sdim if (TheTriple.getTriple().empty()) 47249423Sdim TheTriple.setTriple(sys::getProcessTriple()); 48223013Sdim 49223013Sdim // Adjust the triple to match what the user requested. 50223013Sdim const Target *TheTarget = 0; 51223013Sdim if (!MArch.empty()) { 52223013Sdim for (TargetRegistry::iterator it = TargetRegistry::begin(), 53223013Sdim ie = TargetRegistry::end(); it != ie; ++it) { 54223013Sdim if (MArch == it->getName()) { 55223013Sdim TheTarget = &*it; 56223013Sdim break; 57223013Sdim } 58223013Sdim } 59223013Sdim 60223013Sdim if (!TheTarget) { 61239462Sdim if (ErrorStr) 62239462Sdim *ErrorStr = "No available targets are compatible with this -march, " 63239462Sdim "see -version for the available targets.\n"; 64223013Sdim return 0; 65223013Sdim } 66223013Sdim 67223013Sdim // Adjust the triple to match (if known), otherwise stick with the 68234353Sdim // requested/host triple. 69223013Sdim Triple::ArchType Type = Triple::getArchTypeForLLVMName(MArch); 70223013Sdim if (Type != Triple::UnknownArch) 71223013Sdim TheTriple.setArch(Type); 72223013Sdim } else { 73223013Sdim std::string Error; 74223013Sdim TheTarget = TargetRegistry::lookupTarget(TheTriple.getTriple(), Error); 75223013Sdim if (TheTarget == 0) { 76223013Sdim if (ErrorStr) 77223013Sdim *ErrorStr = Error; 78223013Sdim return 0; 79223013Sdim } 80223013Sdim } 81223013Sdim 82223013Sdim // Package up features to be passed to target/subtarget 83223013Sdim std::string FeaturesStr; 84224145Sdim if (!MAttrs.empty()) { 85223013Sdim SubtargetFeatures Features; 86223013Sdim for (unsigned i = 0; i != MAttrs.size(); ++i) 87223013Sdim Features.AddFeature(MAttrs[i]); 88223013Sdim FeaturesStr = Features.getString(); 89223013Sdim } 90223013Sdim 91263508Sdim // FIXME: non-iOS ARM FastISel is broken with MCJIT. 92263508Sdim if (UseMCJIT && 93263508Sdim TheTriple.getArch() == Triple::arm && 94263508Sdim !TheTriple.isiOS() && 95263508Sdim OptLevel == CodeGenOpt::None) { 96263508Sdim OptLevel = CodeGenOpt::Less; 97263508Sdim } 98263508Sdim 99223013Sdim // Allocate a target... 100226633Sdim TargetMachine *Target = TheTarget->createTargetMachine(TheTriple.getTriple(), 101226633Sdim MCPU, FeaturesStr, 102234353Sdim Options, 103234353Sdim RelocModel, CMModel, 104234353Sdim OptLevel); 105223013Sdim assert(Target && "Could not allocate target machine!"); 106223013Sdim return Target; 107223013Sdim} 108